Drilling machine



Dec. 4, 1945. w. B. BURKE DRILLING MACHINE sheets-sheet 1 FiledV Feb. l, 1944 Dec. 4, 1945. l w. B. BURKE 2,390,420 DRILLING MACHINE l Filed Feb. 1, 1944 6 Sheets-Sheet 2 Dec. 4, 1945u w. B. BURKE DRILLING MACHINE Filed Feb. l, 1944 6 Sheets-Sheet 3 Dec. 4, 1945. w. B. BURKE DRILLING MACHINE Filed Feb. l, -1944 6 Sheets-Sheet 44` w. B. lBURKE DRILLING MACHINE Dec.- 4, `1945.

Filed Feb. 1, 1944' e Sheets-sheet 5 @Q AQ Patented Dec. 4, 1945 UNITED STATES PATENT OFFICE i f DRILLING MACHINE A Wilbur B. Burke, cleveland, ohio Application February 1, 1944, Serial No. 520,649

slolaims. (ci. 779-21) 'I'his invention relates to drilling machines having opposed aligned spindles.

In the drilling of a, bolt shank to providea transverse hole adjacent' the threaded end for receiving a cotter pin, or nut locking wire, it is diicult to form this transverse hole without creating a burr at one or both ends of the hole which prevents the smooththreading of the nut on the bolt, or' threading of the bolt into a threaded socket. It is therefore an object of this `invention to provide a drilling machine which is so constructed and arranged that a transverse hole can be quickly drilled through the bolt shank at a predetermined position and the opposite ends of the holes being entirely free from burrs.

Another object ofthis invention is to provide a machine of this kind which is automatic in its operation and will thereby speed up the drilling operation.

' A further object of this invention `is toprovide in a machine of this kindan opposed pair of drill cam means being so arranged that one spindlev will lag behind the other spindle so that each drill may cross thecenter line of the bolt shank, the

earlier operating drill retreating out of the drilled hole ahead of the later operating drill, and the latter drill part lly rea'ming the inner portion of the `hole form d by the earlier drill. f

A further object of this invention is to provide` in a machine of this kind" an improved automatically operable bolt clamping means for holding the bolt during the drilling operation.

A further object of this invention is to provide in a machine of thiskind an automatically operable bolt clamping means for holding the bolt during the drilling operation, and automatically operable meansfor tightening the bolt in the clamping means prior to the firm clamping of the bolt bysaid clamping means, the tightening operation being only momentarily operative.

With the foregoing objects and others which may hereinaftenfappcar, the invention consists of the novel construction, combination and arrangement of parts as will be more speciiically referred to and illustrated in the accompanying drawings, wherein are shown embodiments of lthe invention, but it is to be understood that changes,

' modications and variations may' be resorted to which fall within the scape of the invention Vas claimed.` i l In the drawings: Figure 1 is a detail front elevation partly broken away of' a drilling machine constructed according` to an embodiment of this invention,

Figure 2 is a fragmentary longitudinalsection f the machine, i Y i l Figure 3 is a fragmentarybottomplan of the machine, i

Figure 4 is a fragmentary sectional view taken` on the line 4 4 of Figure '1,

l Figure 5 is a sectional View taken on 5--5 of Figure 4, l i l Figure 6 is a fragmentary sectional view taken on the line lie-6 of Figure, 4, i

Figure 7 is a fragmentary top plan portion of the machine, Y l i Figure 8 is a fragmentary sectional View taken on the line 88 of Figure 6, M

Figure 9 is a fragmentary sectional view-` taken on the line 9 9 of Figure 6,

Figure 10 is a fragmentary sectional View taken on the line Ill-I0 of Figure 3,

Figure 11 is a sectional view taken `on ||-`ll' of Figure 10, l

Figure 12 is a fragmentary sectional View taken on the line I2--l2 of Figure 3,

Figure 13 is a fragmentary sectionalview taken on line |3-I3 of Figure 2,

Figure 14 is a plan view partly in section of the motor cradle, and

Figure 15 is a sectional View taken `on line 15--15 of Figure 14. l

Referring to the drawings the numeral 2U designates generally a table or bed which is mounted on supporting legs,2|. i The table or bed,2 mat7 be rectangular in plan and has mounted ontheupper side thereof a pair of drill operating motors 22 and 23. The motors 22 and 23 are dis-` posed in axial alignment andare movable end. wise towards and from each other. The mounting means for each motor is identical. and is shown more specifically in Figures 13, 14 and 15. A cradle generally designated as 24 is secured to the motor 22 and comprises a pair of elongated bars 25 provided with an outwardly projecting tongue 26 which is engageablein ahorizontallfy disposed guide 21 formed in a guide bar 218. There of the rear line `are two of these elongated bars 25 and two guide the .line

bars 28, the latter being secured to the upper side of the table by fastening members 28a. The slide bars 25 have secured to the opposite ends thereof arcuate b ars 29 which engage at the opposite ends of the motor 22, and the motor bolts 3|) are adapted to be extended through openings 3| provided in the upper ends of the arcuate bars 29 so that the motor 22 will be rmly secured within the cradle or slide member 24.

The motor 22 includes an armature shaft 32 having a drill chuck 33 mounted on the inner end thereof, and the motor 23 includes an armature shaft 34 having a drill chuck 35 mountedon the inner end thereof.

Referring now vto Figures 1, 2, 3,10 and 11, the motors 22 and 23 are adapted to be moved towards each other for drilling an article disposed between the drills 36 and 31 carried by the chucks 33' and 35, respectively, by means of a pair of rotating cams 38 and 39. A depending stationary shaft 4|) having a head or plate 4| secured at the upper end thereof is secured beneath the bed 28' by fastening members 42. A worm gear 43 is rotatable on the shaft 49 and is provided with a cylindrical hub 44 on which the cam members 38 and 39 are firmly secured. A worm 45 which is mounted on a drive shaft 46 journalled in a bearing 41 secured beneath the table 26 meshes with the common gear 43 and is adapted to rotate this latter gear. The drive shaft 46 may be connected to a suitable power device, such as a motor or the like, which may be supported in any suitable manner with respect to the table 29.

yThe cam members 38 and 39 are of like construction, cam member 39 being uppermost and these members are secured, as shown in Figure 12,

- to the worm gear 43 by means of at least a pair of bolts or fastening members 48. The two cam members 38 and 39 may be formed with arcuate slots 50 'and 5|, respectively, through which the fastening members 48 are adapted to engage so that cam member 38 may be circumferentially adjusted with respect to cam member 39. The cam members are of like construction, as shown in Figure 3, and include an arcuate cam surface 52 which terminates in an abrupt radial suf face 53.

There are a series of these arcuate cam surfaces 52 on each cam member so that the motor operating plungers or rods will be reciprocated a number .of times for each complete rotation of the commongear 43 and the cams 38 and 39. The cam assembly including the two cams 38 and 39 and the cam gear 43 are held on the shaft 49 by meansof a nut 54 which is threaded on the lower end of the shaft 40 and bears against the lower endof the hub 44.

Preferably, a thrust washer 55 is interposed between the upper end of the nut 54 and the lower end of the hub 44. A horizontally slidable plunger or elongated rod 56 is slidable in a pair of bearings 51 and 58 which are secured to the lower side of the table 29 adjacent one end thereof. The inner end of the rod or plunger 56 is provided with a cam engaging head 59, the rod 56 engaging the lower cam 38. A second horizontally slidable plunger or rod 69 is slidable in a pair of bearings 6| and 62 which are secured beneath the table 20 adjacent the end thereof opposite from the guides or bearings 51 and 58. The rod 69 at its inner end is formed with a cam engaging head 63 which is adapted to engage the arcuate cam lobes or elements formed on the periphery of the cam member 39.

A rock lever 64 is disposed at one end of the bed or table 20 being rockably mounted on a pivot member 65 which is carried by a pair of outwardly extending ears or arms 66 which may be formed integral with the outer guide or bearing 58. The lower end of the rock lever 64 engages against the outer end of the plunger or slide member 56 and the rock lever 64 at its upper end has threaded therethrough a motor adjusting member 61 having a hand wheel or knob 68 at its outer end. The inner end of the adjusting member 61 which is in the form of a screw bears against a plate 69 carried by the outer end of the motor 22.

The adjusting member 61 is provided so that the drill 36 of the chuck 33 may be adjusted endwise with respect to the drill 31. A second rock lever 19 is rockably mounted on a pivot 1l carried by a pair of outwardly extending ears or arms 12 which are carried by the outermost bearing or guide 62. An adjustable screw 13 is threaded through the upper portion of the rock lever 19 and bears against a plate 14 carried by the outer end of the motor 23. A knob vor wheel 15 is carried by the outer end of the screw 13 so that the motor 23 and the drill 31 operated thereby may be adjusted endwise with respect to the drill 36 and the motor 22.

The two motors 22 and 23 are adapted to have substantially equal endwise movement towards and from each other but preferably, the movement of the motor 22 lags behind the movement of the motor 23 so that the two drills 36 and 31 may be moved inwardly past theV center line of a bolt which is being drilled through by the drills as will be hereinafter described. v

The proper timing of the movement of motor 22 with respect to motor 23 is attained by circumferentially adjusting cam 38 with respect to cam 39 so that the radial faces 53 of the cam lobes 52 will be positioned out of alignment with the radial faces of the cam lobes of the cam 39. Motor 22 is returned to its outermost inoperative position by means of a' spring 16 which at its outer end bears against the inner end of the motor 22 and at its inner end bears against a sta-- with the outer ends of "-plungeis` 56 and 69, re-

spectively. and also serve to maintain the inner ends of the plunger lever operating rodsagainst the cam members 38 and 39.

The drills 36 and 31 are adapted to drill a diametrical hole through a threaded bolt and preferably through the threads of the bolt at a predetermined point adjacent the threaded end of the bolt as will be hereinafter described.

Referring now to Figures 6, 8 and 9, the block 11 has mounted on the upper side thereof a pair of bolt clamping members 19 and 89 which are rockably carried by pivot bolts 8| and 82 respectively. The bolt clamping lever 19 at its forward end is provided with a bolt clamping jaw 83 which is formed with fragmentary threads on the inner side thereof for receiving the threaded end of a bolt B. The lever or clamping member` 38 is formed with a bolt clamping jaw 84 at its forward end which confronts the jaw 83, and the jaw 84 is also formed with fragmentary threads for` engaging thethreads Aof the bolt B.` An eX-' pending springe'which'is mounted in opposed sockets '86 and 81` formed in the levers 19 and 80 constantly urges the jaws 83 and 84 apart to released position. A jaw member 83 is provided with a horizontal drill guide opening 88 and jaw member 84 is also'provided with a drill guide opening 89. Drill36V is adapted to engage in opening 89, whereas drill 31 is adapted to engage in opening 88. y

The bolt clamping' levers 19 and 86 are formed with'rearwardly projecting armsV 90 and 9|, respectively, having forwardly convergent confronting faces 92 and 93, respectively. An operating` plunger94, which is as shown `in Figure 8 polygonal in transverse section, is slidably mounted in a guide passage `95 provided in the rear portion of the block 11. A plate 96 is secured by fastening members 91 to the upper side of the block 11 and holds the plunger 94 in the guide passage 95. `The forward end of the plunger 95 is formed with a lever spreading head 98 which is adapted to engage between the rearwardly divergent faces 92 and 93, so as to move the jaw members 83 and 84 towards each other and to bolt clamping position.

Spring 99 is disposed about the rear end portion of the plunger 94 bearing at its rear end against a collar or washer xed on the plunger 94, and the forward end of the spring 99 is seated in a recess I 0| formed in the rear side of *he block11.

lReferring now to Figure 4, the plunger 94 is adapted Vto be moved inwardly to operative position by means of a rock lever |02 which is mounted on a pivot |03. `The pivot |03' is carried by a pair ofears |04 which are formed integral with a -plate `|05 secured to the underside of the bed 20. The lever |82 is rocked by means of a cam |06 which is secured to the lower side of the cam 38. The configuration of cam |06 is shown more clearly in `Figure 3 and includes a plurality of circumferentially spaced apart cam lobes iillhaving arcuate outer sides |08, a beveled leading end |09 and a radial trailing end I|0.

A plunger having a cam engaging head or inner end I |2` is slidable in a guide or bearing l I 3.

The guide or bearing I|3 is supported by means of a pair of forwardly projecting arms I4 which may be formed `integral with the lower ends of the arms orlears |04. The `cam member |06 is `of annular construction and is provided on the innerV circle thereof with an annular groove II5. A` pair of clamping bars I6 are adapted to clamp the `cam member |06 in its proper position, the clamping bars |I6 being of L1shape in transverse section, as shown more clearly in Figure l0. One leg of each clamping member ||6 is adapted to bear against the lower side of the cam member 38, whereas-the other leg of the clamping member I|6 is horizontal and the outer terminal end thereof is seated in the annular groove I5. The clamping members II6 are secured to the lower cam 38 by fastening members I|1 which are threaded into the cam 38.

The bolt B is supported in a vertical position whereby the lower threaded end thereof will be disposed between the jaws 83 and 84 by means of a bolt supporting plate or table I i8. The plate 5 I8 is supported above the block 11 by means ofV a pair of vertical supporting rods H9. The rods |.I9 at their lower. ends engage in sockets |28 carried by the block 11 and are secured in adjusted `position in the sockets, by means of set screws I2 I. The plate` I I8 has formed integral with the upper side thereof a pair of split bosses |22 through which the rods or supporting mem- |bers II9 engage. Tightening bolts |23 engage through the split portions of the bosses |22 so as to tightly clamp the plate I|8 with respect to the supporting rods I I9. The p-late I I8 is formed in its forward edge with a recess or slot |24 within which the upper end of the bolt B is adapted to engage, the head |25 of the bolt resting on the upper side of the plate I I8 and being larger than the width of the slot or recess |24.

In order to provide for partial rotation of the bolt B to tighten the latter between the jaws 83 and 84 andthe plate I I8, I have provided a pair of rollers or wheels |26 and |21. Wheel |26 is fixedly mounted on a shaft |28 whichv has a grooved pulley |29 on the end thereof opposite from the wheel |26. Wheel |21 which is spaced from wheel 26 is mounted on a shaft I 30 having a grooved pulley I3| on the outer end thereof. Shaft I 28 is journaled in a pair of bearings |32 and |33 which are carried by a rockable lever |34. The lever |34 is provided with a pair of upwardly projecting ears |35 disposed on oppositesides of the shaft |28 and pivot member '|36 extends through a pair of stationary ears |31. carried by the plate I I8, the pivoti|36 also engaging through the ears |35 below the shaft |28.

Shaft |30 is journaled in a pair of bearingsi|38 and |3'9 which are carried by a rock lever |40. The rock lever |40 is formed with a pair of upwardly projecting ears |4| positioned between a pair of stationary ears` |42 carried by the plate H8. A pivot member |43 extends-through the ears |4I and I42so as to pivotally support the lever |40 and the bearings |38 and |39 with re-` spect to `the plate I8. A iiexible and elastic belt |44 engages pulley |29 and also engages about armature shaft 32. A second flexible and elastic belt |45 engages pulley I3.| and also engages about armature shaft 34. Shafts I 28 and |36 operate in reverse direction with respect to each other; but inthe same direction as shafts 32 and 34.`

Normally the bolt rotating wheels |26 and |21 are disposed in the disengaged position with respect to the head |25 of the bolt B, the elastic belts |44 and |45 swinging the levers |34 and |49 downwardly at their outer ends so as to raise the wheels |26 and |21 from the head |25 of the bolt. The wheels |26 and |21 are moved downwardly to bolt head engaging position by means of a fork lever |46. The lever |46 includes a pair of spaced arms |41 which at their forward ends overlie the bearings |32 and |38. The lever |46 also includes a common arm |48 which projects rearwardly from the pivot |49 for the lever |46. The` pivot |48 engages through a pair of upstanding ears |50 which are carried by the upper side of the plate IIB.

The forked lever |46 is rocked downwardly at its forward end to bolt rotating position by means of a vertically slidable rod or plunger |5| which is slidable through an opening |52 `in the rear portion of plate I I8. The lower end of the rod or plunger |5| is formed with a cam engaging head |53 which is adapted to engage an upstanding cam |54' carried by the upper side of plunger 94. The cam |54 is substantially V-shaped in transverse section and isy so positioned with respect to the head 98 of plunger 94 that rod |5| will be raised to operative position after head 98 has moved forwardly between the arms 39 .and 9 At this initial spreading of arms 9!! and 9|, jaws 83 and 84 have only partially gripped'bolt B, the threads of jaws 83 and 84 partly engagingV the threads of bolt B. When rod |5| is moved upwardly the forward ends of the arms |41 of fork lever |46 are swung downwardly, thereby lowering wheels |26 and |21 to bolt head engaging position, and at this time belts |44 and |45 will be tightened `by raising of the outer ends of levers |34 and |40 so that shafts |28 and |39 will be rotated with shafts 32 and 34, respectively.

After the peak of cam |54 passes forwardly beneath the cam head |53, the rod |5| will drop downwardly and belts |44 and |45 will pull levers |34v and |46 respectively downwardly at their outer ends and wheels |26 and |21 will be raised to their normal disengaged position with respect to the head |25 of the bolt. f

In the use and operation of this drilling machine, the bolt B is inserted at its upper end in slot or opening |24, the head |25 engaging the upper side of the. plate ||8 so that the bolt B will depend from plate i8 with the lower threaded end thereof engaging in a forwardly opening slot |55 which is formed in the forward side of block 11. In their initial inoperative positions motors 22 and 23 will be disposed with the drills 36 and 31 spaced outwardly from jaws 83 and 84. In Figures 1 and 2, the motors 22 and 23 are positioned at substantially their midway position.

As the cams 38 and 39 are rotated by worm gear 43 which is under constant rotation from drive shaft 46 and worm 45, the plungers 56 and 60 riding over the cam lobes 52 will be forced outwardly, and outward movement of rods or plungers 56 and 60 will rock the upper ends of levers 64 and inwardly.- Inward rocking of the upper ends of levers 64 and 10 will force the motors 22 and 23 inwardly against the tension of springs 16 and 18. At a time prior to the engagement of drills 36 and 31 with the lower end of the bolt, the bolt clamp operating plunger will be moved outwardly by cam lobes on cam |06. As plunger 94 is moved inwardly by rocking of lever |02, the bolt clamping levers 19 and 80 will be rocked toward clamping position by head 98. As plunger 94 moves inwardly cam |54 will raise rod |5| before levers 19 and 80 are in their completely clamped position so that lever |46 will berocked downwardly at its forward end, bringing bolt rotating wheels |26 and |21 into engagement with the head |25 of the bolt.

The bolt is thereby threaded tightly into clamping jaws 83 and 84, the head |25 tightly engaging the upper side of plate ||8. As plunger 94 continues to move inwardly toward bolt clamping position, cam |54 will ride forwardly beneath cam head |53 of plunger rod |5| so that this latter rod will be in a released position and at this time elastic belts |44 and |45 will swing levers |34 and |40 downwardly at their outer ends to disengage wheels |26 and |21'from the head of the bolt.

Preferably, the cams 38 and 39 are so adjusted relative to each other that drill 31 begins its inward movement ahead of drill 36 and drill 31 will pass the axial center of bolt B at about the time drill 36 contacts the periphery of the bolt B. When the plungers 56 and 6U pass over the arcuate rise portions of the cam lobes, they will be moved inwardly in a quick movement by the radial trailing ends or surfaces 53 of the cam lobes.

When pressure of the motors 22 and 23 has been released by the passing over of the inner ends of the plungers 56 and 60 on the cam lobes of cams 38 and 39, springs 16 and 18 will force motors 22 and 23 outwardly, motor 23 going outwardly first and motor 22 following motor 23. At the time motors 22 and 23 are moved outwardly to their inoperative positions, spring 99 will move plunger 94 outwardly to released position andspring |15` will also open jaws 83 and 84. The now drilled bolt may be removed from the supporting plate ||8 and a new bolt inserted in the opening |24. By providing the opposed clamping jaws 83 and 84 through which drills 36 and 31 engage, the hole drilled through the bolt by these drills will not have a burr or burrs at the opposite ends of the hole, the clamping jaws 83 and 84 constituting jigs for guiding the drills and for preventing the formation of burrs at one or both ends of the transverse bolt hole.

This invention is an improvement overthe drilling jig construction embodied in application Serial Number 514,682, filed December 1'1, 1943, by Fred H. Cameron.

What I claim is:

1. A drilling machine comprising an opposed pair of drilling members, means for reciprocating said members, a pair of workpiece clamping members, a slotted support above said clamping members for dependingly supporting a workpiece with a portion of the latter between said clamping members, and means operated in timed relation with respect to the reciprocation o f said drilling members for clamping'a workpiece between said support and said clamping members. 2. A drilling machinecomprising an opposed pair of drilling members, means for reciprocating said members, a pair of workpiece clamping members, means operated in timed relation with respect to the reciprocation of said drilling members for clamping a workpiece, a supporting member disposed above said clamping members for dependingly supporting a workpiece in a position with a portion of the latter disposed between said clamping members, and means operated in timed relation with respect to said clamping means and active after said clamping means has initially moved to clamping position and prior to the time the latter are in full clamping position for rotatably adjusting the workpiece relative Vto said clamping meansand said supporting member. v

'3. A drilling machineas set forth in claim 2 wherein said third mentioned means includes a pair of rockable pressure members adapted when in operative position to engage the workpiece, and means normally maintaining said pressure members in inoperative position. Y 4. A drilling machine as set forth in claim 2 wherein said third mentioned means includes a pair of rock members, rotatable workpieceV ad-` justing members carried by said rock members, and means connecting said adjusting members with said drilling members for operation thereby. 5. A drilling machine as set forth in claim 2 wherein said third mentioned means includes a pair of rock members, rotatable workpiece adjusting members carried by said rock members, means connecting said adjusting members with said drilling members for operation thereby, a fork lever, a pivotal support for said fork lever, said each plunger engageable with the opposite end of the latter, means adjustable relative to said rock lever and engaging a drilling member whereby the endwise position of one drilling member may be adjusted relative to the other drilling `member, a pair of pivoted workpiece clamping members, timed means for moving said clamping members to clamping position, means above said clamping members for dependinglyl supporting a workpiece in a position for engagement by said clamping members, means carried by said supporting means engageable with the workpiece whereby to tighten the workpiece between said supporting means and said clamping members. WILBUR B. BURKE. 

